* {
    margin: 0;
    padding: 0;
    text-decoration: none;
    box-sizing: border-box;
}

.nav {
    width: 100%;
    height: 100px;
    background-color: yellow;
    display: flex;
    justify-self: center;
    justify-content: end;
    align-items: center;
    line-height:1000px;
    font-size: 20px;
    text-align: center;
}

.nav a {
    text-decoration: none;
    margin-right: 20px;
}

.set-user {
    width: 400px;
    height: 500px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    position: absolute;
    left: 50%;
    margin-left: -300px;
    top: 50%;
    margin-top: -300px;
}

.set-user input {
    display: block;
    width: 80%;
    height: 50px;
    margin: 20px auto;
    border: 1px solid #333;
    font-size: 18px;
    text-indent: 1em;
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.1);
}

.set-user h4 {
    text-align: center;
    margin-right: 100px;
}